121220808480 has 144 divisors (see below), whose sum is σ = 413996224824. Its totient is φ = 32299745280.

The previous prime is 121220808437. The next prime is 121220808493. The reversal of 121220808480 is 84808022121.

It can be written as a sum of positive squares in 4 ways, for example, as 74601089424 + 46619719056 = 273132^2 + 215916^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1805920 + ... + 1871840.

Almost surely, 2^121220808480 is an apocalyptic number.

121220808480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220808480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206998112412).

121220808480 is an abundant number, since it is smaller than the sum of its proper divisors (292775416344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220808480 is a wasteful number, since it uses less digits than its factorization.

121220808480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67219 (or 67208 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 121220808480 in words is "one hundred twenty-one billion, two hundred twenty million, eight hundred eight thousand, four hundred eighty".